JPS5815824Y2 - Auxiliary heating device for air conditioner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a novel structure of an auxiliary heating device in a heating air conditioner.

An air conditioner (heat pump type room air conditioner) that performs heating operation by making a cross-fin indoor coil act as a condenser through a heat pump compression refrigeration cycle.When the outside temperature drops, the condensing pressure and temperature decrease and the heating capacity of the indoor coil decreases. Because of the problem of extremely low heat, it is common practice to install an electric heater as an auxiliary heat source in the indoor coil section.

In this case, if the electric heater were to overheat, it could lead to a serious accident such as a fire, so it is necessary to install a safety device to prevent overheating. Conventionally, the above safety device was attached to the fin. Ta.

However, the temperature of the safety device must be sensed by the fin, which is located quite far away from the electric heater, and it was difficult to attach the safety device to the fin in a way that would allow for good heat transfer. Therefore, the detection accuracy was poor and it could not be said to be suitable for ensuring reliable protection.

The present invention has been made in order to provide an auxiliary heating device that can eliminate such conventional defects, ensure the function of the safety device, and improve reliability in terms of safety.

The specific contents of the present invention will be explained in detail below with reference to the accompanying drawings.

In Figures 1 and 2, 1 is the indoor coil of a heat pump type room air conditioner, and a cross-fin type heat exchanger is used, but during the winter heating season, the indoor coil 1 is used as a condenser by operating the heat pump compression refrigeration cycle. to act on,
The heating heat source is obtained from the latent heat of condensation of the compressed refrigerant gas.

The indoor coil 1 has a known configuration in which heat exchanger tubes 2, 2, . . ., passing through fins 5, 5, . However, in some of the heat transfer tubes 2, 2, etc., two or more adjacent tubes, for example, three in the middle section, are separated from the refrigerant system by removing the U-shaped tubes, and then the separated heat transfer tubes are separated from the refrigerant system. Both ends of the heat tubes 2, 2, 2 are opened straight.

Then, the electric heaters 3, 3 are inserted into the other two heat exchanger tubes 2, 2 except for the above-mentioned heat exchanger tubes 2, 2, 2, which are open at both ends, and installed inside, and the electric heaters 3, 3 heat the refrigerant. It is formed into a container.

Various types of electric heaters 3 can be used, but
A rod-shaped sheathed heater or the like is suitable.

A safety device 4 associated with the electric heater 3, such as a thermal fuse or a thermostat, is installed in the remaining heat exchanger tube 3, excluding the heat exchanger tube 2.degree. 2 in which the electric heater 3 is installed.

An example of the above-mentioned safety device 4 is shown in FIG.
Glass tube 6 is connected in series with temperature fuse 8 that melts at ℃.
It has a structure in which heat-resistant electric wires are drawn out from both ends of the heat exchanger tube 2, and are inserted into the heat exchanger tube 2 and fixed therein.

It is preferable that the heat exchanger tube 2 with the safety device 4 installed therein be located above, below, or in the middle between the heat exchanger tubes 2 and 2 with the electric heater 3 installed therein.

In the auxiliary heating device having the above configuration, the electric heater 3 is housed inside the heat transfer tube 2, so most of the generated thermal energy contributes to heating the refrigerant, resulting in extremely low heat loss and high heating efficiency. .

Moreover, since the safety device 4 is also installed inside the heat transfer tube 2 adjacent to the electric heater 3, the heat generated by the electric heater 3 is reliably transmitted to the safety device 4 through the fins of the indoor coil 1 that are closely connected to the heat transfer tube 2. , the temperature sensing characteristics of the safety device 4 are safe and improved, and therefore the protection performance is perfect.

As described above, the auxiliary heating device of the present invention has heat transfer tubes 2 in the cross-fin indoor coil 1 that functions as a condenser.
Separate two or more adjacent parts of the refrigerant system from the refrigerant system,
Both ends of the separated heat transfer tubes 2 and 20 are opened, and electric heaters 3 are installed inside the heat transfer tubes 2 except for one of them to form a refrigerant heater, while the remaining heat transfer tubes 2 are heat tube 2
The electric heater 3 is characterized by a structure in which a safety device 4 related to the refrigerant heater is built-in, and the electric heater 3 includes a heat transfer tube 2,
Since the generated heat is reliably transferred to the refrigerant through the fins, the heating efficiency is much higher.Furthermore, since it is a method that directly heats the refrigerant, the exothermic temperature can be lowered compared to air heating methods. It is possible to provide a highly safe heating device by suppressing the heating to a low range.

Furthermore, since a thermal safety device 4 is installed inside the heat exchanger tube 2 adjacent to the heat exchanger tube 2 in which the electric heater 3 is installed, a group of fins interposed integrally in both the heat exchanger tubes 2, 2 is provided. It is possible to reliably transmit the heat generated by the heater to the safety device 4 through the safety device 4. Therefore, the safety device 4 has excellent heat-sensitive characteristics and stable and reliable operation is guaranteed, so it is possible to obtain an extremely safe device. .

In addition, electric heater 3. Another advantage is that the safety device 4 can be easily inserted and removed from the open end of the heat exchanger tube 2.degree. 2, making it very convenient for maintenance services.As described above, the present invention has various excellent effects.

[Brief explanation of the drawing]

Each figure shows an example of the device of the present invention. Figure 1 is a front view of the indoor coil, Figure 2 is an implied structural diagram of the main part of the indoor coil shown in Figure 1, and Figure 3 is a diagram of the safety device. It is a structural diagram. 1...Cross fin type indoor coil, 2...
...Heat transfer tube, 3...Electric heater, 4...
・Safety device, 5...Fin.

Claims (1)

[Scope of utility model registration request] Heat exchanger tubes 2 in a cross-fin indoor coil 1 that acts as a condenser in a heat pump compression refrigeration cycle
Separate two or more adjacent parts of the refrigerant system from the refrigerant system,
Both ends of each of the separated heat transfer tubes 2゜2 are opened, and electric heaters 3 are installed inside all but one of the heat transfer tubes 2 to form a refrigerant heater. Heat exchanger tube 2
An auxiliary heating device for an air conditioner, characterized in that a safety device 4 related to the refrigerant heater, such as a temperature fuse, is installed inside.